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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958e11c7213a77b8b55df0076039ca58d8ceb394238c2d3701f8cfdc9c97e11d' 
  AND token = 'sFUiiDwWSOsrx8hkhIy21HGFO2dtoAKpdn3jlaVh+mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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