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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9193f8b5953f1362c4eb339351f4b6591deed7ac4bf42f5f46405ce987b363e4' 
  AND token = 'iNKfhn/0FfbhV3dyZyws545hB902pvrQ/aYxISJPFTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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