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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97319b11323f7dbc24ae7ee9eb4136c9d7eaba6f25f4b3fdde1d3ceb466e39e' 
  AND token = 'JggTXeb9ZD6+pMhZKBtFXzopRD63OrCKoKwrwN8Xef4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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