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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcad9e2fedf75b9a5eb2d8a4ba2fef64484b43db6208fe554492a873bae35729' 
  AND token = 'XDgo+nRoYx3DMlicwIKakVsxdZem4T74VZ5ySIK+JSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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