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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f62f0d1df9452b38e3ccfd532a606d2f1425f3338a2d67394656326f896a660' 
  AND token = 'g6Uf/+53KZKWZ7equwSlAkK03b+Lymyev01p/P9btsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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