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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6825d412825431f1033bea1f7e7f74a151a04738ffffe8bfdb63a3c524ce4cf' 
  AND token = 'JYJF76CNkqOmsuMO/J83u4hy1JrXQtM1arVhv/8SCtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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