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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e47fe61b3492b0e4438c17bf72f49ac00682351342ab792614d96999747cdc' 
  AND token = '4/9f8wOaQVoMp4D4ud8CR+ArRgGepuVf1FfAncQHKqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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