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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd002e14f58b225f6a837e4d2bb2161900ae40f8a18c85f8bfb02ceeb9d1ee5' 
  AND token = 'XxjHc8cwCw4eQPF0QrGo34Ye2a8Tg4XkFYQ7GftQLGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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