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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d158af578a1e4f27f2a6c7b6a1c2bac28e1ed9da6f86a39e518a1309ce55a3a' 
  AND token = '9c0mCMkEPQ1+1TtJCUYHZOEVFX9WXmuz8TGjFjMCSc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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