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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f423fc8763d0475cabf4f27b579dc2c32f1df7570bfa9f6eba65f12bcbd422' 
  AND token = 'WBajKPmjOyGr5U6WIeVIxwGVk37iFe+KQmt45/zcI1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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