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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee09e45665ec579e095728744237c1226f150d4250df842634c075b6807930d4' 
  AND token = 'pKO3vLMYk8i/WLQ20qqviI66QAPNKoST9oGncIy/Ghc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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