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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5dff80f3494d8abee01151a853112c787e34086f84ef0f23c9e9310d729ddb' 
  AND token = 'VoR/sJaq4Tdh6TIE+vFCBq4jEW2S62MUaUt80mfeINM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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