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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa32049f37363bcbcd38ed73993f3cec88af123a49d5d4d90caada8225a2e14' 
  AND token = '9QmgZ/TISHMgigE2vIShLt1XlYBL/gNnSL9BONghR+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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