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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab2e9e3ff011c5c8a263c383e25d84f1a8df80d068250bfeb3b46e171f0c53e' 
  AND token = 'EvZHx4HZG0ngvDgSaV/hRoOQ/TWN3k3IoojHBbaoFGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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