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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd35f1cfca3ec92753f36e0865575228f9521aed993dfc56dd0e22437a3d497' 
  AND token = '7AV8weGl5xV0BbzSCB+Q41cCA9DuZf66iocuv//cXgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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