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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6f662333b4755cfd1cbcddf6235ba20c8da87176988334584950225a2c5a13' 
  AND token = 'OUT94cER01usaOBL1EyjXnVa+XTg3P2/w75/xXDs1eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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