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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64daa649a4c91e1d3aecd9f6d988c222d91db5892111d3393ea694c12a3a8ca' 
  AND token = '9eSKfN+uSTtV7efOlg47M4QKgYH1j/YeaMQYxqVZcVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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