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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b50ddd3fdfb3ee82217f3513cca8ee2baec96c9c5acaafdab296d4d1c8bdaa' 
  AND token = 'YPFlAAwuP8ej267MlrD0/FLamle8/GkDniH6CmeKCPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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