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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cd411ba3e707c5c8941dc0abde9038ba237ec075bd357e9a5ecf01173f06f7' 
  AND token = '1eaYgIygOA+zkGEryy9x/ktoP5lK0J5zYsJGua04i8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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