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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1433bf4dbc47072032d7c4b8203ec541944b20e0575825811dd4cd066a6d9f0d' 
  AND token = 'v3auLgg+new3n18RioODf6Kx9q6K0o3tELOfMOsG0c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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