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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99313d3d65bc2b4c0af0305baaeb897b8466b11eaa00c9d62ed9901a64df2328' 
  AND token = 'ZnHx6SlP5SEUkAqMl5zXwg4VWQ2OZ3VSBa3777k+WWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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