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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3284f13d712f5b3b04d29a4abb5a450d9a3c347694e7acefd817e3043643ef46' 
  AND token = 'wI3URA1RmuR8giFbA/7AzY6oogI5URmvAyqK77NbqPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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