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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6f2d7dd4dcad319fc04623ed008d1a36adafc3caf2505ca4e7f0bbd47b7677' 
  AND token = '2l73Dj2bLx13s3NCJXYwBETEUsvaxwzD+HXKiRpC1B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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