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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa700c718a3df86f9baad6b6b5472c469bfad83f2dc15441ca879210a0cfef0' 
  AND token = '11K+7TKjvQpimmmzVmb6gDDdTNIo+RAFXanFzfmI4Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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