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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e96ce2d27152de62e061bed7cdccf8dff4bd373f6404509c966701a8b5501d3' 
  AND token = 'OYHA3wSd8PQCEw6uT/+X8MvWUOlc6KqqE0hFmkFbeXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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