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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875dbe1c2cece7bef5e7845e15a77ef017ef5f4b204da2fd4c96ebd5c79d1918' 
  AND token = 'Dt8czWKIYYt5+CjF6ubcGv/QOPq3JsZaI1ptEtw6TtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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