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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b454098dcd18bbad5f468a104c0352971c94feba1a85334f37e208d0c7aa52b2' 
  AND token = 'Nd8q3e0DSJI2pMQeHGyTSmoS+KEmwRRt5C7x/7zt7hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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