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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865a1561eed380fadcb1604784162955a61a788db5e7ddfb9f76eec6e419a104' 
  AND token = 'dApaBmhdJ2BEiE+Rk3q/wFuUbeyJ7O3MtAO5rXIv9fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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