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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd7845fed3b35821f92454cfe6e75e8ed5dff738ce8d0a8ab31e163eeee8125' 
  AND token = 'mUJnZupg+voyxxnAc55NSvqAzNomxminB0XQ1XCPVZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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