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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573ae4e393e6060aff942e231fd259f1c454fa917d51d6322b9b5c80d0f64900' 
  AND token = 'ryC+5fPEso+WBCYJUYirr9ZeK/9wroQ+Sv146qOxk4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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