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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e2812584f87cf3252dc42e3369905e5491634cadef52d62eeea91738bdb5e8' 
  AND token = 'rHh3bQqSsxxEKK0PB4kqsg8023X6I7pM743GKtHp4JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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