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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cabb8fa6e323fdddf5c1748f626f6941ddadadad763c4135321d6599a217879' 
  AND token = 'f6K2kTd0jCdmomm/na8T74T+31vOF73MQjfqs4PAy2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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