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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f0046dd3731a7b5967c2d0fbef6b5504513006505b3e0acd94076ce28c4933' 
  AND token = '+cBXFn5iJu3rmfGdI0Y1Hmc4BDPHMTbQ4pV7LzkoRbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}