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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb593024dc15f63e8379ea456f499b4f7746205e4701ca441a6a3341d6443960' 
  AND token = 'TK9E4smvc7molcmT/RBhdtIS1d9Hia3dmiaMM/tVKes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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