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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202654f91fbb119270249b7baa915c89ccaeebf186f5218b85023100fe1438be' 
  AND token = 'GtDz2gB0zONHQ+xHBlAwZhOW3Up7QspEAEGyqgslkPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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