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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56046cef794edb89ee54e479fa227edbfbc6f9716bba57f0ff4622315a32b75' 
  AND token = '7fumjwoytn6dBJ1OSKT8WmsJmUGe0boDmzY1frts7Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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