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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f00d62438676a13e6822ffb42b0187761ba3fd6ee581bb78eeeb726c4715dba' 
  AND token = 'JmjnzNr5aeYX1orqIETRzjNLwh3s/OBMiMUe705nUUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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