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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94284a592dfd7255366e81d453af49d78702790cc4d1f23b8fede94a99e3a78' 
  AND token = 'Ay1HPENsz84/pjICLr24Lwq+EalYUyYv0ThYUvhjM30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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