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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6767310126cdaf094adb5ed8c5653b7d6447c3d5401f251505760f09ce04f187' 
  AND token = 'c7DqPI5V5JLfDdIjsEiDsKTP/8wD2yubC0ratBxEU8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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