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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f129ef65514ec8055415fe5a5ed6ff8a8447cf0b6e6e7c175dd188c074c6b19' 
  AND token = 'yiPN5ebvkCP7PzE3hpaudvPU8C9w3OnvZJCx98J5OLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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