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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc09db98702b3bdd2895adf2f431a629d2bb3bf5d0f7bf5c4185a485775871c' 
  AND token = 'aGqIWLHbFGVDHKkftL76kAmxrJtEfiJpp44SVyclKaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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