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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f70c064b5cf5ef7a9f0f9bd841e6588723cc3f2b1db4453b99b89f9aed95c67' 
  AND token = 'GtQP1Ww9F+NfUKKohtEti0RzvkoSZeQLuDl8TjyBdkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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