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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c695d252ee65dc2d7117119083b1373d12bb1bc3c7370e219377ebc35234c006' 
  AND token = 'xLkNXDX7MXQ6ynsv5E9a9sVtPIo1+xRN+qWsle9C1BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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