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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6865949282c81582b5a77ac0e6c7b29f4a69fcd9ef556007ddf69b9e9512eb' 
  AND token = '37xzU0YY1V64dKvMeysTaOd13fMW2kJipTTdDseOIM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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