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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4affba3015fd2da6bd4da1f8c2af43acd7d6efdedb40c949eb395566183df669' 
  AND token = 'Tr3aaWLl89l6LAbYISJtqBvz6SxGZ8NrKE/8+YL6fmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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