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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d815bb3f30f47f3e7e6ee123ae1c8b22ef120e67fb9d4da1f278aaf3b60f49a' 
  AND token = 'JDReKIoEx2R6ZSRIRzoSK5dPWA3Iyi5H67UXlgUKP8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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