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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b9de5c50e0f38b524bea85aef35fce96988a7b1661525569e362207905b7b7' 
  AND token = '5QLrwrza2X0ymH7ATMkSvtTP+M+iJeGqcMNKHop1Ors=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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