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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983aedd734118b221e2cf32f8604a924f96e94f31db2d06e08b332be3525eda7' 
  AND token = 'GiuDnQUEM2mpfzGCz+9mZJbSCMauFMOWP9pTebun+lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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