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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcbb6996699678c1ffcd9694cf0245d1167753df5044413d29b60d0ec8b94dd' 
  AND token = 'Xezv9GcSBMC4R0F1tHBMdniA0Iw1rcSbbvD+TtXocUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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