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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacbb3d0e28e873505c7546ddf0ef19dcb6a55e594b811727f5e13d3b25cec6c' 
  AND token = '65SU9XbuSLABLRzK2Hmy23O7SUpOialv5vo+VNo2KFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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