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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8438338e5661347fec02dc24648fdd87a3dea282e008e901f9f6d5acba3947ad' 
  AND token = 'GHmLpZL26MOkC1HsmGdKnYeGHiU/s6Iarq8ad2fROzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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