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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b5536d7a06e435f67743ec940861871e08af06efc8ad0e4ef9176e4d3b4276' 
  AND token = 'vE1TnE0wlCAVY2mvIvAhte2d5/3hGKl4vhGVPZuskUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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