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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3442c717af26e72daf1a0f8f4f26c34d80a513ba59d86018c0218cf35b32dca2' 
  AND token = 'iMRLPPNHZDmzRNl5nomMPNEMhpvIM1mgvLO/ijiovuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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